Oxygen therapy refers to all kinds of anoxic treatment, in addition to the elimination of the cause of hypoxia, can be given oxygen inhalation treatment. Inhaling high concentrations of oxygen increases the amount of dissolved oxygen in the plasma to improve the oxygen supply of the tissue. It is also the use of supplemental oxygen to improve the body's physiology, biochemical environment, and promote the metabolic process of a virtuous cycle, in order to treat diseases, alleviate symptoms, promote rehabilitation and prevent lesions, improve health.